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Barrier performance of cements and concretes in nuclear waste repositories

Description: Das Projekt "Barrier performance of cements and concretes in nuclear waste repositories" wird vom Umweltbundesamt gefördert und von Forschungszentrum Jülich GmbH, Institut für Sicherheitsforschung und Reaktortechnik durchgeführt. General Information: Cement barriers have been demonstrated to provide physical and chemical containment of nuclear waste. The problem has been to verify the mechanistic basis of their performance now and in the future. The project aims at unifying practical and theoretical approaches to performance testing and prediction The fundamental science of immobilisation will be developed by enhancing computer-based models of chemical behaviour and linking chemical models with physical models of transport properties of permeable materials and of cracked barriers. Modest data base expansion will be undertaken. Test methods will be developed which realistically accelerate degradation of cements in a range of natural environments. These test methods will be applied to a range of inactive simulants as well as active wastes. Furthermore, they will be closely linked with field trials at Mol and with the computer-based simulations described above. The inactive components of radioactive waste streams may interfere with performance. Consequently, the impact of waste stream constituents such as flocs upon leach properties and performance will be determined. Inactive simulant and active cemented waste samples will be tested at Mol using oxidised and fresh (reduced) clay. These realistic tests will parallel accelerated laboratory leach and modelling predictions, the three sets of results from computer modelling, from accelerated tests and from actual exposure will be critically compared and evaluated. The range of temperatures will be 20-85 C and groundwater compositions range from pure to saline. The Mol pure water composition will provide an important benchmark. The methodology used throughout will be standard but state-of-the-art. The participants have all had extensive experience in the field and, in many instances, will have worked together in the course of previous EC programmes. The coordinator will work with partners to ensure the best possible sharing of experience to enhance the value of the project to the Community and its member states. Prime Contractor: University of Aberdeen, Department of Chemistry; Aberdeen; United Kingdom.

Types:

SupportProgram

Origin: /Bund/UBA/UFORDAT

Tags: Zement ? Beton ? Jülich ? Werkstoff ? Radioaktiver Abfall ? Salzstock ? Vereinigtes Königreich ? Reinwasser ? Abfallbeseitigung ? Bodendegradation ? Containment ? Lagerstätte ? Materialprüfung ? Software ? Lehm ? Staatenvereinigung ? Abfalllager ? Simulation ? Stand der Technik ? Werkstoffkunde ? Grundwasser ? Kerntechnik ? Abfallart ? Modellierung ? Chemische Stoffeigenschaft ? Chemikalien ? Physikalisches Modell ? Radioaktiver Stoff ? Verkehrsleistung ? Abfall ? Benchmarking ? Schadstoffverhalten ? Forschungseinrichtung ? Verkehrstechnik ? Freilandversuch ? Physikalische Größe ? Datenbank ? Modellrechnung ? Eignungsfeststellung ? Belastungsanalyse ?

Region: Nordrhein-Westfalen

Bounding box: 6.76339° .. 6.76339° x 51.21895° .. 51.21895°

License: cc-by-nc-nd/4.0

Language: Deutsch

Organisations

Time ranges: 1997-01-01 - 1999-12-31

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